<!DOCTYPE html>
<html>
    <head>
        <script type="text/javascript" src="js/jquery-3.5.1.js"></script>
    </head>
    <body>
        <button id="getBtn">query</button>
        <button id="delBtn">delete</button>
        <button id="addBtn">add</button>
        <button id="updateBtn">update</button>
    </body>
    <script type="text/javascript">
        $("#getBtn").click(function(){
            window.location.href='query.html'
        }),
        $("#delBtn").click(function(){
            window.location.href='delete.html'
        }),
        $("#addBtn").click(function(){
            window.location.href='add.html'
        }),
        $("#updateBtn").click(function(){
            window.location.href='update.html'
        })
    </script>
</html>